#btn {
        width: 30px;
        height: 30px;
        background: url("../img/music.png") no-repeat;
        background-size: 100% 100%;
        -webkit-background-size: 100% 100%;
        -moz-background-size: 100% 100%;
        -ms-background-size: 100% 100%;
        -o-background-size: 100% 100%;
        position: fixed;
        top: 2.1866666666666665rem;
        right: 2rem;
        z-index: 6666;
    }
